from the looking-down-on-reentry dept.
astroengine writes "On Saturday, Oct. 29 at 5:04 a.m. EDT, a Progress Cargo Module undocked from the ISS and drifted away with a full haul of space station trash. It gradually slowed, deorbiting and dropping into the atmosphere at 8:48 a.m. EDT, leaving a blazing trail in its wake. Space station astronauts videoed the event as it unfolded."
egrep patterns are full regular expressions; it uses a fast deterministic
algorithm that sometimes needs exponential space.
-- unix manuals